/**
 * @描述
 *     定义输入输出对象
 */
Info << "读取beta" << nl << endl;
volScalarField beta
(
    IOobject
    (
        "beta",
        runTime.timeName(),
        mesh,
        IOobject::MUST_READ,
        IOobject::AUTO_WRITE
    ),
    mesh
);
Info << "读取速度U" << nl << endl;
volVectorField U
(
    IOobject
    (
        "U",
        runTime.timeName(),
        mesh,
        IOobject::MUST_READ,
        IOobject::AUTO_WRITE
    ),
    mesh
);
Info << "读取扩散率" << nl << endl;
IOdictionary transportProperties
(
    IOobject
    (
        "transportProperties",
        runTime.constant(),
        mesh,
        IOobject::MUST_READ_IF_MODIFIED,
        IOobject::NO_WRITE
    )
);
dimensionedScalar gamma = dimensionedScalar("gamma", transportProperties);
